Quote:
Originally Posted by livewire516
Thanks for the input. I suspected that may be the case - being GM's 'smallest' Gen III+ motor, I assumed that also meant it's pretty much de-tuned to a significant extent
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Well it's more that:
1. It's a mass market GM product
2. The engine doesn't have a whole lot of features to tweak
I think you have an EGR valve, but chances are it's running close to max capacity and tuned pretty carefully. Usually Toyota, Honda, Subaru, Mazda, Ford, GM, BMW, MB, companies with big R&D budgets won't be winging it on the tuning.
That means the tradeoffs you can usually make are:
1. Advancing timing for higher octane fuel or reduced oil mist from crankcase ventilation or reducing margin of safety for knock
2. Running leaner where the ECU goes rich (tip in, high rpm, high throttle, cold start)
3. Running lean